It is not clear to me how to access an object in the structure
“Postprocessor”. The idea is that I compute the solution, but I am also
computing secondary variables using the postprocessor structure in this way:
dealii::DataOut<dim> data_out;
data_out.attach_dof_handler(dof_handler);
Postprocessor postprocessor;
data_out.add_data_vector(solution, postprocessor);
data_out.build_patches();
When declaring the postprocessor class, I declare a function
evaluate_vector_field where I compute all the secondary variables that are
written on a vtk file later:
void evaluate_vector_field(const
dealii::DataPostprocessorInputs::Vector<dim>& input_data,
std::vector<dealii::Vector<double>>& computed_quantities) const override;
…..
for (int q = 0; q < n_q_points; ++q) {
// Displacements
computed_quantities[q](0) = input_data.solution_values[q](0);
computed_quantities[q](1) = input_data.solution_values[q](1);
// Stress
computed_quantities[q](2) = sigma_x
computed_quantities[q](3) = sigma_y
}
These variables are saved on the data_out object, so I use
“data_out.write_vtk(output);” and I get them on the vtk file. However, I do
not know how to access to these new variables (computed_quantities) from
another file different from the one where I declare the functions.
The function evaluate_vector_field is a virtual function, and it is
declared as const override. I do not know how to export the variables
computed_quantities or modify them, because it is only allowed to read them
since the function is declared as constant. Is there any way to access the
structure postprocessor? Something like:
postprocessor.getVariables(xxxxxxxx)
Or an example where I can see how to implement it. Thank you very much in
advance
Raul
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